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Freezing up, home ac unit no air flow after running a while

Ac home unit freezing up. no air flow after running a while .no air comes out .living in dallas tx 98 'today. the ac filter is clean inside house. the out side unit is clean also. we do not know why the unit is freezing up so no air will come out at all .

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A low freon level in the unit can cause them to freeze up. Are the fins behind the filter clean?

Posted on Jun 19, 2009

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We have a Frigidaire FAK124R1V AC. Can turn it on, but NO air comes out. We've cleaned the filter and clicked the reset button several times. Is there something else to try before calling for service?


If you choose to use the air conditioner to cool a room when the outside temperature is low, any condensation that naturally accumulates on the cooling coil inside the unit can freeze. When the coils freeze over, the air flowing through the unit fails to cool, and in your case may have blocked any air flow. I assume you can hear the fan but get no flow?
Freezing may damage the unit. Allow the unit to defrost by turning it off and leaving it off for several hours, or even days, to allow warm air to flow through the coils and melt the ice. Of course if you live in a place like Minneapolis you might be waiting until April. But you should be able to check whether the coils are clear by removing the filter and shining a flashlight through the air-exhaust cavity. The coils are usually visible just inside. If the ice doesn't melt quickly enough, you can speed things up by pointing the hot air of a hair dryer at the coils through this opening.
I also assume since you are in apt you have no access to the exterior side of the unit to check what is going on? Or if this is a window unit just take it out of the window for awhile (granted ... that can be a pain in the you know what).
Good luck on your troubleshooting ... I think you are the right track

Jan 14, 2018 | Frigidaire Heating & Cooling

1 Answer

AC works for about 300 miles then stops and blows hot air. New AC compressor and freon charge. After sitting for a while it will again blow cold.


I think you have a similar problem to mine. At highway speeds is when it happens. And it is not blazing hot? Right?
Your evaporator is freezing up - as this happens the ice surrounding it prevents the flow of air over the evaporator coils and the result is warm air coming out of the registers. If I turn off the AC for about ten minutes and let unit melt the cold air comes back. This does not occur in stop and go driving.
I combat it by either running the fan at a higher than normal setting to increase air flow over the evaporator and then turning off when it gets too cold, OR using the air control to allow warmer outside air to enter into unit at highway speeds to prevent freezing up.
Newer cars have more sophisticated sensors and controls to prevent this but some older vehicles are subject to this anomaly.
Since it works fine under normal conditions I have not messed around with the freon level in system. If you release a tad of refrigerant the low pressure switch will shut off the compressor sooner and help minimize ice buildup. Good luck.

Aug 19, 2016 | 2000 Ford Taurus

1 Answer

Unit freezies ,blow does not blow sometimes


Your unit was run without filters in place and the coil has a dirt/fuzz coating that gets wet from condensation and then freezes when unit is on. When this happens less and less cold air comes out of vents making unit run continuously . The fix. Turn the AC off and run fan only until air flow returns to normal and air is warm. Then carefully remove debris from return air coil on the air filter side

Oct 22, 2015 | Heating & Cooling

1 Answer

Why is my brisk air duo therm rv ac freezing up on the inside.


Where you see frost all the time, wait for unit to thaw and start cooling again and carefully slide hand up in that hole and see if you can feel cool air leaking in from divider that separates cool and return air, that will cause freeze-ups as well. Use foil tape if necessary to stop any cool air coming in to return air from around divider. Also, if you have any diffusers closed, (on ducted system in ceiling) or partially closed, open them all up full flow. If you restrict the cold air from coming out too much, it can also cause freeze up. One more thing, take cover off where cool air box is and double check that something isn't restricting the flow of cold in to the duct work if it has ducted system.

Jul 12, 2014 | Dometic Rooftop RV Air Conditioner

1 Answer

Rheem 13AJA30A01 freezing


You have one of three problems. First freezing can be an air flow problem. Air flow could be causes by using the new pleated air filters. The best one still blocks >35 % of the air flow. The best air filter for home ac units is still the blue mesh type Ace hardware sells. If you have a good filter then you need to check out the inlet side of your evaporator to see how clogged the air inlet is. If it is dirty the air flow is reduced and if reduced enough, the evaporator can freeze solid all the way out to the compressor. The second cause for freezing is a bad or improperly operating blower motor. The third possible cause for freezing is the metering device not functioning properly and metering to much.

Jun 14, 2014 | Rheem 13AJA30A01 2.5 Ton 13 SEER R22 Air...

1 Answer

Armana APN14K-E portable AC freezes up


Lack of air flow or a lack of refrigerant are the two primary reasons why coils freeze. Clean the filter and the coil, if frost continues it is likely low on refrigerant.

Jun 30, 2017 | Haier Amana Apn14ke-E 14 000 Btu Portable...

1 Answer

Air Cools well but after about an hour, water starts coming into the coach through the discharge air side. Unit does not freeze up but if I shut the unit off, the tray that holds the water drains quickly,...


Your evaporator is probably dirty and is blocking some of the air flow so the air has to move around the coil and starts coming in through the condensate drain holes. That stops the condensation (water) from draining out the holes because the air is pushing it back in.Try having the unit cleaned and that should stop that leaking.

Jun 27, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

The fan is running and blowing cool air out of the unit but there is no air coming through the vents, what are the possible problems? (Lennox Elite series)


The unit could possibly have a frozen indoor coil. Turn ac to off...and fan switch to on...wait 45 minutes and see if air flow improves. Check for dirty filter which can lead to freeze up. Low on freon is also a possibility.

May 18, 2010 | Heating & Cooling

3 Answers

My A/C evaporator is freezing up, and wont cool the house below 85 degree


Check your filter and make sure you have one in place and it is clean. This is either a low inside airflow problem or system is low on freon. If you have strong air flow from vents and filter is been kept clean then low freon is most likely. Run system in on position with cooling off to make sure ice is melted. When water stops draining. then restart system . If it starts frosting up at outside unit shortly after start up it most likely is air flow. If you don't have at least 15 degree drop from registers in a few minutes and indoor humidity is not too high inside and airflow decreases and air gets colder just before it freezes up then it is low freon.

Jun 29, 2009 | Heating & Cooling

1 Answer

Duo Therm AC not working


If unit was freezing up the air flow would normally stop, until the unit is turned off and allowed to thaw. I suspect evaporator blower may have a worn out belt, or compressor is shutting off due to control or internal overheat. What is the age of the unit?

Aug 06, 2008 | Dometic Rooftop RV Air Conditioner

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